The movie will be directed by "Man of Steel" and "Batman vs. Superman" helmer Zack Snyder once he's done with the latter tentatively titled film, which stars Ben Affleck as Batman and Henry Cavill as Superman once again. (The Brit actor also wore the "S" on his chest for 2013's "Man of Steel.")

Both Affleck and Cavill are expected to reprise their characters in the Justice League movie, along with "Batman vs. Superman's" Gal Gadot as Wonder Woman.

Silverman told the WSJ that the plan is to have "Batman vs. Superman," the 2016 follow-up to "Man of Steel," set the stage for a broader gathering of DC Comics' heroes.

“It will be a further expansion of this universe,” he said. “'Superman vs Batman' will lead into ‘Justice League.’”

The script for the project is still in development, and the WSJ doubts we'll see the movie land before 2018. It's also unclear what other characters could appear, although Warner Bros. has cast theater actor Ray Fisher as Victor Stone/Cyborg for "Batman vs. Superman," so there's a chance we may see him pop up in the Justice League installment as well.

As the details are hammered out, director Snyder has plenty to do. Production on "Batman vs. Superman" is supposed to begin next month in anticipation of its May 6, 2016.